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Forestry CD Activity Guide Cover, You Will See a Forester Demonstrating the Correct Technique to Determine DBH with a Biltmore Stick

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Forestry CD Activity Guide Cover, You Will See a Forester Demonstrating the Correct Technique to Determine DBH with a Biltmore Stick chapter 8/27/56 9:33 AM Page 2 Source: Project Learning Tree K-8 Activity Guide: page 243 2 chapter 8/27/56 9:33 AM Page 3 TOOLS USED IN FORESTRY Biltmore stick – Clinometer – Diameter Tape – Increment Borer – Wedge Prism Throughout history, the need for measurement has been a necessity for each civilization. In commerce, trade, and other contacts between societies, the need for a common frame of reference became essential to bring harmony to interactions. The universal acceptance of given units of measurement resulted in a common ground, and avoided dissension and misunderstanding. In the early evolvement of standards, arbitrary and simplified references were used. In Biblical times, the no longer familiar cubit was an often-used measurement. It was defined as the distance from the elbow to a person’s middle finger. Inches were determined by the width of a person’s thumb. According to the World Book Encyclopedia, “The foot measurement began in ancient times based on the length of the human foot. By the Middle Ages, the foot as defined by different European countries ranged from 10 to 20 inches. In 1305, England set the foot equal to 12 inches, where 1 inch equaled the length of 3 grains of barley dry and round.”1 [King Edward I (Longshanks), son of Henry III, ruled from 1272–1307.] Weight continues to be determined in Britain by a unit of 14 pounds called a “stone.” The origin of this is, of course, an early stone selected as the arbitrary unit. The flaw in this system is apparent; the differences in items selected as standards would vary. In an attempt to standardize forestry methods and measurements, tools and practices were developed which became the universal common reference for all foresters. In the first three of the following activities, students are asked to use measurement techniques in situations which they have not previously encountered. For example, people have not always had tapes to measure distance. Earliest methods used the length of one’s own stride or pace as a unit of measure. Today, foresters still use their pace when cruising timber or determining the height of trees in the field. However, they determine the length of their pace to standardize their work in the field. The length of their pace is used as an aid to determine the height of a tree. Other activities give students an opportunity to work first hand with tools and practices used by foresters. Earliest methods for measuring the height of trees used what we recognize today as simple trigonometric functions. For example, to measure height, it has been recorded that some groups of Native Americans would walk away from an object (and facing away from it) until they could sight the top of the object while holding their ankles and viewing through their legs. When the top was just visible through their crotch, they turned around and paced the distance back to the object. The distance they paced was equal to the height of the object, assuming that the angle formed by this sighting is equal to 45 degrees.2 The purpose of this segment is to acquaint the student with the specialized tools and measurement practices employed by foresters in collecting forest data. In addition to the primary purpose of making the students familiar with the names, form, function, and purpose of each tool, these 3 chapter 8/27/56 9:33 AM Page 4 activities are designed to reinforce and make relevant for students basic skills and values that they have learned or are now learning. The emphasis placed on the tools activities is for “hands-on” employment of skills and practices, which add not only to the student’s skill level but also to the integration of the skills as a relevant and valued part of their functioning. The opportunity to exercise skills in different situations provide a series of “teachable moments” that attract students. 1. The World Book Encyclopedia, 1996 Edition, Volume 7, p. 352 2. “Trees as a Crop,” in Our Wonderful World, Aims Education Foundation, Fresno, CA, pp. 17–26 4 chapter 8/27/56 9:33 AM Page 5 Subjects: ACTIVITY 1 Math, Science, Social Studies EARLY MEASUREMENTS Objectives: A. Set the stage 1. Students will determine their own individual measurements using two How many students have ever heard the phrase “this methods: (1) individual criteria, horse is 15 hands high?” Before there were standard- (2) standardized measuring devices ized measuring tools like rulers and tape measures, 2. Students will realize that different people determined the height of horses by counting results occur from individual criteria and how many times the width of their hands would go standardized norms from the ground to the top of the horse. As the stu- 3. Students will examine the possible economic and societal implications of dents will discover, it was not a truly accurate meas- non-standardized criteria. urement since people’s hands vary in size, but it was an early effort to have a uniform system of measure- Skills: ment. The use of the term “hands” (with an assigned Measuring, estimating and predicting, standardized value) continues to be used as a meas- inference, recording data, interpreting data, urement for horses. addition, subtraction, multiplication, circle/diameter concepts B. Procedure Materials: 1. Divide students into groups of five. ♦ Yard stick or meter stick for each group 2. Distribute Student Worksheet 1 and yardstick or ♦ Student Worksheet 1 (Appendix A) meter stick to each group. 3. Using yardsticks have each student measure: a. their hand span with their fingers stretched out as far as possible; b. the distance from the tip of their nose to the tip of their thumb; c. their arm span; d. their cubit (elbow to middle finger). 4. Have students determine the group average of each measurement. 5. Collect the yardsticks. 6. Using only the information that they have gathered in step 3, have each group determine the following: a. the length of the classroom; b. the length of one side of their desk; c. the height of the classroom door; d. the height of the classroom ceiling. 7. Redistribute the yardsticks and have each group measure 6 a., b., c., and d. again. 8. In a discussion ask each group: a. What was the length of the classroom in step 6? Step 7? b. What was the length of the side of the desk in step 6? Step 7? c. What was the height of the classroom door in step 6? Step 7? d. What was the height of the classroom ceiling in step 6? Step 7? e. What are some of the difficulties they encountered in making these measurements? f. Did everyone have the same hand span? Arm span? Cubit? g. Did the yardstick make the measurements more consistent? 5 chapter 8/27/56 9:33 AM Page 6 h. If you were selling cloth in a fabric store, would you allow customers to use the early method of determining yards by measuring a length of cloth from the tip of their nose to the tip of their thumb? Why or why not? 9. Take students outdoors to a pre-selected tree. Ask them to work in groups and again use the yardstick to: a. measure the circumference of the trunk; (Note: The circumference is defined as the distance around the trunk.) b. measure the height of the tree; c. compare results; d. Ask why there were significant differences in the results. (Note: The trunk of a tree is smaller as you move up – therefore the circumference will vary depending upon where on the trunk the measurement is made.) Subjects: ACTIVITY 2 Math, Social Studies THE NATIVE AMERICAN METHOD OF Objectives: MEASURING TREE HEIGHT 1. Students will become aware of the cultural diversity that can be examined Procedure: through the use of methods used in 1. Have the students stand with their back against earlier/different societies. the tree. 2. Students will realize that group results 2. Have them walk away from the tree, stopping at reflect multiple influences and factors. intervals to bend over and sight the tree by 3. Student will compare/contrast the results of each group. looking through their legs while holding their ankles. Skills: 3. When the top is just visible through their crotch, Visualization, measurement, addition, they will turn around, and walk back to the tree multiplication, comparison, contrasting, while counting the number of steps they have to tabulation. take to return. The distance paced is assumed to Materials: be equal to the height of the tree. ♦ Student Worksheet 2 (Appendix A) 4. Compare the results of each group and discuss difficulties and the accuracy of the method. (Inaccuracies will result from the fact that each person’s pace varies and the angle of view may vary from 45 degrees. 5. Have students determine their pace (Activity 4). Activity 2 is adapted from: “Trees as a Crop,” in Our Wonderful World, Aims Education Foundation, Fresno, CA 6 chapter 8/27/56 9:33 AM Page 7 Subjects: ACTIVITY 3 Math, Economics, Science USING A PERSON OF KNOWN Objectives: HEIGHT TO MEASURE A TREE 1. Students will become aware of the cultur- al diversity that can be examined through Procedure: the use of methods used in earlier/differ- 1. Stand a person whose height is known against the ent societies. tree that the students are measuring. 2. Students will realize that group results 2. In order to calculate the number of “persons” to reflect multiple influences and factors. the top of the tree, you’ll need a pencil or other 3.
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